@Mark see the comment by Shmuel L for a possible reason. Either way, I think that the analysis of which possible Melacha this may fall under should usually take place in a well-formed answer.
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yydlDec 1 '11 at 5:59

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If you're marking your place on Shabbat in order to know where you are when you continue reading on the weekday, this may be considered preparing from Shabbat to the Weekday
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MenachemDec 12 '11 at 17:51

3 Answers
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Based on Shmirat Shabat Kehilchata Ch: 28, 16, we are allowed to fold papers but not to make toys/games, because in the case of the toys you are making a kli. The previous point (28, 15) deals on the issur of making marks, even with the nail. The example brought is to know where we are in a book.

No it is not. (1) Just because one shouldn't fold the page of a holy sefer, does not mean that the same applies to a regular book or magazine. (2) Just because it is a "derogatory practice", does not mean that it is halachically prohibited - during the week or on Shabbos.
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jakeDec 12 '11 at 16:53

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Also, what is this "folding of pages" - is it referring to my case (for a bookmark)?
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yydlDec 12 '11 at 16:58

First of all, where is the permission to waste time reading things like that? I was speaking about a Sefer Kadosh as I said in the answer. Second, yes that is it what discussing.
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Hacham GabrielDec 12 '11 at 17:13